kover and j



M. KOVER AND J. HOLTZMAN.-

RAZOR BLADE STROPPING MACHINE. APPLICATION FILED MAR. B, 1915.

1,325,494. Patented Dec. 16,1919.

Z0 Z5 2x11314 7] MORRIS ROVER AND JOHN HOLTZMAN, OF NEW YORK, N. Y.

RAZOR'-BLADE-'STROPPING' MACHINE. I

Specification of Letters Patent.

Patented Dec. 16, 1 919.

i Application filed March 8, 1915. Serial No.-12-,987.

To all whom it may concern:

Be it known that we, Monnrs Koviin and J OHN HOLTZMAN, the former a citizen of the United States and the latter a subject of the Emperor of Russia, and both residents of the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in RaZor-Blade-Stropping Machines, of which the following is a specification.

This invention relates to machines for stropping razor blades, and its principal object is to provide a simplified, inexpensive, and improved machine for this purpose that can be economically manufactured and sold to the user at low cost.

Other objects and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 shows a general sectional elevation of the razor-blade stropping machine.

Fig. 2 is a plan view of the machine shown in Fig. 1.

A blade holding frame 1, comprising walls 2 and a cross-piece 3 connecting said walls in midway position at their lowerextremities, is secured upon an operat ng handle 4 by fixing the upper extremity -5 of said handle to the underside of the crosspiece 3 midway between its ends. Directly over said handle and cross-piece 3 1s located a roller 6 which is mounted in the upper extremities 7 of the walls 2 of the frame 1,-said roller preferably consisting of a tube 8 driven tightly over a shaft 9 the extremities 10 of which are journaled in bearings 11 formed in said walls. Upon the roller 6 is mounted a blade holder 12 comprlsing legs 13, a beam 14 connecting said legs, and spring-plates 15 secured to said beam, between which plates the razor blade 16 to be sharpened may be inserted and firmly held in the manner shown. The legs 13 of said blade holder are fixed upon the extremities of roller 6, between each extremity of tube 8 and its adjacent side wall 2, by means of providing a fiat portion 17 at each end of shaft 9 between said tube and the wall and providing an opening 18 in each leg 13 to fit the shaft-portion thereat, whereby as said roller is rocked the blade holder is carried therewith and is caused to swing about its axis. At each side of the roller 6 is located a guide-roll 19, which consists of a tube 20 fitting tightly over a shaft 21 the extremitles 22 of which are journaled in bearlngs 23 in the side-walls 2. Said -guide-rQlls-,arejdis posed equidistant-1y from. the L r0ll'er 6 and w strop24 is combined with the machineby passing the opposite strop-extremity 30, first under and around the guide-roll 19 shown nearest the fixture 29 in Fig.1, then over and around the roller 6 and through the blade holder12 between its legs 13, andthen under and around the other;guide -roll; 19. When the machine has been thus combined with the strop 24 it tends to remain in any position along said strop by the slight vbinding action of the strop around guide rol ls 19 and roller 6. V r v N In the operation of the machi-ne the razor blade 16 to be sharpened isinsertedin proper position within blade holder 12, and the opera'tor then grasps the strop-extremityZ-BO and draws the strop 24 tautin about. ahorizontal I position. In this position of the strop 24, the bladeholding frame ;1- of; the

machine and the parts directly connected therewith are disposed above thezstrop, and the operating handle 4" is disposed under said strop and approximately perpendiciularly thereto. The operator -may then, while holding the strop-extremity with the one hand, gras the operating handle'4 with the other and move the handle andentire. 11190111116 along the j strop forwardly j-and backwardly and toward and away from the fixed strop-end 27. As the machine is moved by the operator on its backward stroke away from the fixed strop-end 27 the blade holder 12 and the razor-blade 16 are disposed in the position shown, and the strop 24 tending to impart a clockwise turning movement to roller 6 thereby causes the holder 12 to force the blade against the strop-surface, so that as said blade recedes with the machine from the strop-end 27 its edge 31 adjacent the strop undergoes stropping or sharpening. When the machine reaches the strop extremity 30 and its forward movement has commenced the strop 24 rocks the roller 6 in a counter-clockwise direction, as viewed in the drawing, and thereby swings the blade-holder 12 with the blade 16 in a semicircular curve to an exactly opposite position, whereby as the machine is moved forwardly toward the strop end 27 the opposite side of the blade edge 31 is sub jected to stroppin Upon commencement of the subsequent return stroke of the machine toward the operator said blade holder and blade are swung by strop 24 in a clockwise direction in a semicircular stroke and as the machine advances the first mentioned side of the blade-edge 31 is again stropped. In this manner the machine is reciprocated back and forth with the operating handle 4, and the strop actuates its cooperating roller 6 to impart to the blade-holder and blade a reciprocating semicircular throw whereby each side of the blade-edge 31 is in turn presented to the surface of the strop and moved therealong in a manner required for proper stropping until the razor edge becomes thoroughly sharpened. After sharpening the edge 31 of blade 16 its opposite edge 32 may be sharpened by reversing the position of the blade within the holder 12 and actuating the machine to repeat the above men tioned operation.

Variations may be resorted to within the scope of the invention.

Having thus described our invention, we claim 1. A razor-blade stropping machine hav ing the combination of a strop provided with means for attaching it to a fixed object whereby it may be maintained stretched taut away from the object, a frame on said strop, an operating handle secured to said frame disposed right angularly to the sharpening surface of said strop when maintained taut, a roller mounted in said frame above said handle guiderolls mounted in said frame, one at each side of and below said roller, a blade holder fixedly mounted on said roller and directly carried thereby, said strop passing under one of said guide rolls, over and around said roller and through said blade holder, and under said other guide roll, and said blade holder receiving from said roller a reciprocating throw which is in excess of a semicircular movement thereof when moving said handle toward and away from the attached end of the strop.

2. A razor-blade stropping machine having the combination of a strop provided with means for attaching it to a fixed body, a frame on said strop, an operating handle secured to said frame disposed right angularly to the sharpening surface of said strop, a roller mounted in said frame, a bladeholder fixedly mounted on said roller and directly carried thereby, guide rolls mounted in said frame, one at each side of and below said roller, said strop passing under one of said rolls, over and around said roller and through said blade holder, and under said other roll, and said blade holder receiving from said roller a reciprocating throw which is in excess of a semicircular movement thereof when moving said handle toward and away from the fixed end of said strop.

3. A. razor-blade stropping machine having the combination of a strop provided with means for attaching it to a fixed body, a frame on said strop, an operating handle secured to said frame disposed right angularly to the sharpening surface of said strop, a roller mounted in said frame above said handle, guide rolls mounted in said frame, one at each side of and below said roller, a blade holder fixedly mounted on said roller and directly carried thereby, said strop passing under one of said rolls, over and aroiuid said roller, and under the other of said rolls, and said strop actuating said roller to impart a reciprocating throw to said blade holder which is in excess of a semicircular movement thereof.

Signed at the city of New York, in the county of New York, and State of New York, this 5th day of March, A. D. 1915.

MORRIS KOVER. JOHN HOLTZMAN. Witnesses:

S. GOODMAN, B. ROMAN. 

